題組內容

4. (15 points) A company that is looking at the time to failure of the parts (days) it uses decides to look
at an alternative supplier of the product. The data for the current supplier and for the new supplier are shown here.
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Assume that the data are normally distributed.

(a) Pleme test whether the variances of the time to failure of the parts produced by different suppliers are equal, (Please clearly state the null, the alternative hypothesis, and the test statistic, and use  a= 0.10) (5 pointa)